Process for manufacturing plastic substances from the derivatives of cellulose.



of that of camphor.

TED STATES PATENT oFFIoE.

FEODOR LEHMANN AND JOHAN'NES STOCKER, OF BERLIN, GERMANY.

PROCESS FOR MANUFACTURING PLASTIC SUBSTANCES FROM THE DERIVATIVES OFCELLULOSE.

Patented July 18, 1916.

1 191 80L Specification of Letters Patent.

No Drawing. Application filed March 16, 1914. Serial N 0. 825,158.

and J OHANNES S'rooKER, subjects of the German Emperor, and residents ofBerlin, Germany, have invented certain new and useful Improvements inProcess for Manufacturing tamed 1n the following manner: 600 grams ofcellulose acetate are dissolved in 500 Plastic Substances from theDerivatives of Cellulose, of which the following is a specification.

In the manufacture of celluloid like sub stances from cellulose estersit has not heretofore been possible to substitute an equivalentsubstance for the camphor, which owing to its qualities offers greatdrawbacks.

Trials have shown that the olymers of cumarone (C H O) and indene 11,)when treated with cellulose esters, produce substances similar tosubstances prepared by means of camphor without offering the drawbacksof the latter. Furthermore the cost price of said polymers is about onetwentieth For preparing said plastic substances, the polymers ofcumarone or indene are added to the solutions of cellu lose ester andthe mixture is dried. The amount of said added polymers Varies accordingto the desired degree of elasticity of the plastic substances to beprepared. Said substances are indifi'erent to air and light. They have abright surface and are nearly inodorous.

For preparing transparent products, the used cumarone resin should beaccordingly purified.

Such plastic substances may be prepared for instance as follows: 200grams of cumarone resin are dissolvedin a mixture of sulfuric ether,benzol and alcohol, 100 grams of each, after which 700 grams ofnitro-cellulose are addedto said liquid solution. A substance isproduced which is then treated in the same manner as the solution ofnitrocellulose in the manufacturing of celluloid.

Another similar plastic substance is obesters by means of the polymersof cumarone and indene previously dissolved in a solvent.

2. Process for manufacturing celluloid like substances consisting intreating cellulose esters by means of the resinous cumavrone and indenederivatives of tar oils.

3. Process for manufacturing celluloid like substances consisting indissolving cellulose acetate in tetrachlorethane and in adding cumaroneresin to the solution.

In testimony whereof We have hereunto set our hands in the presence oftwo witnesses.

FEODOR LEHMANN. J OHANN ES STOCKER.

Witnesses WOLDEMAR HAU'PT, HENRY HASPER.

